<template>
<div>数字：{{num}}</div>
<button @click="add">+1</button>
<button @click="dec">-1</button>
</template>
<script setup>
import {ref} from "vue"
        let num =ref(1);
        function add(){
            num.value++
        }
        function dec(){
            num.value--;
        }

</script>
<style>

</style>